70-------0-3M--------36.0 cm/14.1 in--------19.0 cm/7.5 in
80-------3-6M--------38.0 cm/14.9 in--------20.0 cm/7.9 in
90-------6-12M------40.0 cm/15.7 in---------21.5 cm/8.4 in
100-----12-18M-----42.0 cm/16.5 in---------23.0 cm /9.0 in